The Student Achievement Diagnostic Questionnaire (SADQ) is described as measuring: (1) student self concept of ability in English, mathematics, science, and social studies; (2) student attitudes toward their teachers in each of the subjects; (3) student perception of the expectations these teachers have for student achievement in these subjects; and (4) student perception of the future utility of the four subject areas. The 64-item questionnaire is presented, followed by the answer sheet; answers are scaled from seven (strong/high) to one (weak/low). Several 16-item short forms, which include both the questions and the answer sheets, are also included: (1) general SADQ; (2) English; (3) Mathematics; (4) science; (5) social studies; and (6) SADQ for principals--which measures perception of principals' general attitudes toward student achievement. A brief description of field tests of the SADQ is presented, including statistical data on test results and reliability based upon SADQ administration to 2,304 fourth through twelfth grade students in six Georgia public schools. It is suggested that SADQ data can be used to measure motivation to achieve,and to examine differences between schools, grades, and academic subjects. (GDC)